#pragma once
#include<iostream>
#include<assert.h>
using namespace std;

class Date
{
	friend ostream& operator<<(ostream& out, const Date&d);
	friend istream& operator>>(istream& in, Date& d);
public:
	Date(int year = 1900, int month = 1, int day = 1);
	void Print();
	bool CheckDate()
	{
		if (_month < 1 || _month>12
			|| _day<1 || _day>GetMonthDay(_year, _month))
		{
			return  false;
		}
		else
		{
			return true;
		}
	}
	int GetMonthDay(int year, int month)
	{
		assert(month > 0 && month < 13);
		static int mothDayArr[13] = { -1,31,28,31,30,31,30,31,31,30,31,30,31 };
		if (month == 2 && year % 4 == 0 && (year % 400 != 0 )|| (year % 400 == 0))
		{
			return 29;
		}
		return mothDayArr[month];
	}
	bool operator > (const Date& d);
	bool operator <(const Date& d);
	bool operator >=(const Date& d);
	bool operator <= (const Date& d);
	bool operator !=(const Date& d);
	bool operator ==(const Date& d);
	Date& operator+=(int day);
	Date operator + (int day);
	Date& operator-=(int day);
	Date operator-(int day);
	Date& operator++();
	//Date operator-(int);
	int operator-(const Date& d);
private:
	int _year;
	int _month;
	int _day;
};
ostream& operator<<(ostream& out, const Date& d);
istream& operator>>(istream& in, Date& d);